Current-indicator.



J. W. RYAN.

CURRENT INDICATOR.

Patmed July 27, 1915.

JOHN W. RYAN, OFOVERBROOK, PENNSYLVANIA, ASSIGNOR 0Fv ONE-HALF TO LOUIE LENNIG ROWLAND, 0F OVERBROOK, PENNSYLVANIA.

CURRENT-INDICATOR.

maaier.

l Specification of Letters Patent.

Patented .tary at, mit'.

Application filed December 10, 1914. Serial No. 876,492. .f

To alli/whom it may concern .4

Be it known that I, JOHN W. RYAN, a cit-" zen of the United States, and a resident'of. Overbrook, in the county of Philadelphia" and State of Pennsylvania, have invented al the current is on or od, and which is simlnexpenslve and yet ple, comparatively thoroughly reliable.

.The invention will be claimed at the end hereof, but will be first described in connection with the embodiment of vit chosen for illustration in the accompanying drawings, in which- Figure 1, is a top or plan view, partly in section, of a device embodying features of the invention. Fig. 2, is a transverse sectional view of the device shown in Fig. 1, and Fig. 3, is a transverse sectional view taken at right angles to theplane of Fig. 2.

.ln the drawings 1, is a suitable case or housing covered as at 2 with glass. so as to provide a transparent opening'. Within the housing there is arranged a spool 3 of nonmagnetic material and upon this spool is wound a coil 4. Within the spool is arranged a ring 5 of non-magnetic material, which is provided with ears 6.

7, is a non-magnetic drum, as of wood` turnable in the ears and shown as mounted on the spindle 8. 'The drum is provided with a weight as at 9 and with markings of which one OH is displayed through the trans-- parent opening when the drum is positioned bv its weight 9.

10, are strips of magnetic material applied to the drum for turning it when thecoil 4 is/energized to show the other marking 0n, through the transparent opening.

ln use the instrument may be mounted i upon the electrical device, such as an iron,

cooking or if preferred the instrument may be arranged in convenient proximity with the iron, cooking device or the like. In any event the coil 4 is included with the velectrical device, iron, kcooking utensil or the like in the supply circuit. The coil 4 may be a series or current coil, or it may be a shunt or voltage coil. The coil 4 is appropriately wound and its purpose is to create at its center, when it isl energized, a magnetic iield which operates upon the magnetic strips 10 to turn them together with `the drum at right angles to the position in which they appear in Fig. 3. When the current is on or in other words when the electrical device, as an iron, cooking utensil or the like, is in circuit, the coil 4 is energized and operates to turn the drum 7" against the influence of its weight into such position that the word On is plainly visible and since the word On is plainly visible, the user may readily know that the current is on and hence may take proper precautions to prevent accidents.` When the I l'co'oking vessel or the like, or its working v"parts may be attached to the iron, lvessel or the like,

1. A current indicator for electrical devices comprising the combination of a housing having a transparent opening, a nonmagnetic spool in the housing, a coil on the spool, a non-magnetic ring in the spool hav ing ears, a non-magnetic druml turnable in the ears and provided with a weight and with markings of which one is displayed under the influence of the weight, and mag-- netic strips applied to the drum for turning it when the coil is energized to show the other marking, substantially as described.

2. A current indicator of the kind recited comprising the combination of a coil, a member of non-magnetic material arranged in the coil and ,turnable about an axis perv mally turning the member into the posipendicular to the aXis of the coil and pro- In testimony whereof I have hereunto vided With tWo markings, a Weight for norsigned my name.

tion for showing one marking, and a strip 'TOEN W RYAN of magnetic material applied to the member Witnesses: and adapted to turn it when the coil is en- CLIFFORD K. CAssEL, ergized to display the other marking. FRANK E. FRENCH. 

